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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 326 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.41² =
  2. 2.59² =
  3. 3.29² =
  4. 4.21² =
  5. 5.41² =
  6. 6.61² =
  7. 7.21² =
  8. 8.81² =
  9. 9.19² =
  10. 10.51² =
  11. 11.49² =
  12. 12.21² =
  13. 13.71² =
  14. 14.79² =
  15. 15.49² =
  16. 16.41² =
  17. 17.19² =
  18. 18.39² =
  19. 19.79² =
  20. 20.51² =
  21. 21.29² =
  22. 22.39² =
  23. 23.79² =
  24. 24.81² =
  25. 25.71² =
  26. 26.79² =
  27. 27.69² =
  28. 28.79² =
  29. 29.89² =
  30. 30.89² =
  31. 31.29² =
  32. 32.29² =
  33. 33.29² =
  34. 34.41² =
  35. 35.39² =
  36. 36.81² =
  37. 37.19² =
  38. 38.21² =
  39. 39.79² =
  40. 40.81² =

Answer key

  1. 1681
  2. 3481
  3. 841
  4. 441
  5. 1681
  6. 3721
  7. 441
  8. 6561
  9. 361
  10. 2601
  11. 2401
  12. 441
  13. 5041
  14. 6241
  15. 2401
  16. 1681
  17. 361
  18. 1521
  19. 6241
  20. 2601
  21. 841
  22. 1521
  23. 6241
  24. 6561
  25. 5041
  26. 6241
  27. 4761
  28. 6241
  29. 7921
  30. 7921
  31. 841
  32. 841
  33. 841
  34. 1681
  35. 1521
  36. 6561
  37. 361
  38. 441
  39. 6241
  40. 6561

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